Base Keyword

TL;DR

In object-oriented programming (especially in C#), the keyword base is used inside a derived class to refer to its immediate parent (base) class.

How it works

Here’s what that means, clearly and simply:

✅ What “immediate base class” refers to

If you have a class that inherits from another class, the class it inherits from is called its base class. Inside the derived class, the keyword base lets you access:

• The base class’s methods
• The base class’s properties
• The base class’s constructors
• The base class’s indexers

…even if they are hidden or overridden in the derived class.

📌 Example

class Animal
{
    public void MakeSound()
    {
        Console.WriteLine("Animal sound");
    }
}

class Dog : Animal
{
    public void MakeSound()
    {
        Console.WriteLine("Dog sound");
    }

    public void CallBaseSound()
    {
        base.MakeSound(); // calls Animal.MakeSound()
    }
}

Here:

• Animal is the base class.
• Dog is the derived class.
• Inside Dog, the keyword base refers specifically to Animal, which is the immediate parent.

📌 Why "immediate" base class?

If there is a long inheritance chain, like:

Animal → Mammal → Dog

Inside Dog, base always means Mammal, not Animal. So base refers only to the direct parent class.

✔ Summary

• base = direct parent class of the current class
• Used to access overridden or hidden members of the parent class
• Also used to call parent class constructors

If you want, I can also explain how base differs from this, or how it’s used in constructors.

Quick recall Q&A